I've read one book on my vacation, Shawn Blanc's Delight is in the Details and it was an excellent choice. In addition to being an author, blogger, and all-around swell guy, Shawn (Website) (Twitter) loves his iPhone and agreed to share it here.

What are your most interesting home screen apps?

VSCO Cam has become my favorite iPhone photo editing app. They’ve got quite a few filter presets, and several fine-tune-ability tweaks as well. When posting a cool photo to Instagram, I usually edit it first in VSCO Cam and then send it to Instagram.

The new Safari is my favorite iOS 7 app. There are quite a few design changes and improvements that make it leaps and bounds easier and more enjoyable to use than its predecessor.

Scratch is a great quick-capture app. I keep it in my Dock because it launches lickety-split with a blank text entry field. From there I can quickly jot down a fleeting note, a task, or whatever. And if I need to hang on to that note or do something with it, I can toss it from Scratch right into OmniFocus or Simplenote, or send it as an email or text message if I need to.

What is your favorite app?

I don’t know if I could pick a favorite. But…

If I had to pare my iPhone down to just one app, it’d probably be Simplenote. I share a lot of text between my iPhone, iPad and Mac. In the form of lists, ideas, notes, and articles-in-process. Right now those are split up into apps that do one thing well. So: OmniFocus for lists, Simplenote for ideas and notes, Byword (on Mac and iPhone) and Editorial on iPad for articles-in-process. But if I had to, I could consolidate those things into one app — Simplenote — and survive.

From a more personal context, Day One is also a favorite. Not only is the app itself well-designed and fun to use, but it’s become the place where I keep track of small and big life events.

Which app is your guilty pleasure?

Dots. A simple, whimsical game that seems so easy yet actually takes quite a bit of skill to excel in.

What is the app you are still missing?

When Google Reader shut down, I moved my RSS subscriptions over to Feed Wrangler. Reeder has long been my favorite RSS reading app, and though it works with Feed Wrangler, it doesn’t fully support all of its APIs (such as Feed Wrangler’s smart streams and filters). I’d love for Reeder to get tighter integration with Feed Wrangler, or else have another really great iPhone RSS app come along.

How many times a day do you use your iPhone?

Two less than the legal limit.

What is your favorite feature of the iPhone?

Hardware-wise, it’s still the Retina display. Though LTE speeds are very nice, and the day-long battery life is great, the screen is the “window” into the soul of the iPhone.